chore: add CODEOWNERS file

[dianab-cl]

Adds .github/CODEOWNERS to assign @cosmos/stack-team as code owners for all files.

[greptile-apps]

Greptile Summary

This PR adds a .github/CODEOWNERS file that assigns @cosmos/stack-team as the required code owner for every file in the repository. The ** glob pattern is valid in GitHub's CODEOWNERS syntax and will correctly match all files and directories.

Confidence Score: 5/5

Safe to merge — minimal config change with correct CODEOWNERS syntax.

Single-line addition of a valid CODEOWNERS file. The ** glob pattern is correctly supported by GitHub and covers all files. No logic, no risk.

No files require special attention.

Important Files Changed

Filename	Overview
.github/CODEOWNERS	New CODEOWNERS file assigning @cosmos/stack-team as owner for all files via the ** glob pattern.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Pull Request Opened] --> B{Files Changed?}
    B -->|Match ** pattern| C[CODEOWNERS Rule Triggered]
    C --> D[Request Review from @cosmos/stack-team]
    D --> E{Team Review Approved?}
    E -->|Yes| F[PR Eligible to Merge]
    E -->|No| G[PR Blocked — Awaiting Team Approval]

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_{Reviews (1): Last reviewed commit: "chore: add CODEOWNERS file" | Re-trigger Greptile}